help me please

You paid cash for $1,600 worth of stock a year ago. Today the portfollo is worth $2,626. Required: a. What rate of return did you earn on the investment? (Negative value should be indicated by a minus sign. Round your answer to 2 decimal places.) b. Now suppose that you bought the same stock but bought it on margin. The initial margin requirement was 65%. Recalculate your rate of return, ignoring any interest due. (Negative value should be indicated by a minus sign. Round your answer to 2 decimal places.) c. Recalculate the rates of return for a cash purchase in the event that the stock is worth $825 today. (Negative value should be indicated by a minus sign. Round your answer to 2 decimal places.) c. Recalculate the rates of return for a cash purchase in the event that the stock is worth $825 today. (Negative value should be indicated by a minus sign. Round your answer to 2 decimal places.) d. Recolculate the rates of return for a margin purchase in the event that the stock is worth $825 today. (Negative value should be indicated by a minus sign. Round your answer to 2 decimal places.)